Cry Baby: The Pedal That Rocks The World - watch the trailer

The wah-wah pedal, its undeniable impact on guitar tone history, and its own confusing roots - invented around 1965 and evolved by Thomas Organ, Vox and Clyde McCoy before Jim Dunlop claimed the Crybaby name in 1966 - is the subject of a new documentary.

Cry Baby: The Pedal That Rocks The World drops in February 2011 - you can watch the trailer above for a sneak peak.

The film looks at how engineer Brad Plunkett developed the legendary wah sound and how artists have used it to express themselves throughout its evolution. Guitar icons such as Buddy Guy, Eddie Van Halen, Kirk Hammett, Slash, and Zakk Wylde talk about how the wah has become a part of their signature sounds - while rock journalists such as Rolling Stone's Ben Fong-Torres and Guitar Player's Art Thompson explore the pedal's cultural significance.

101 best stompboxes

Very much related is Guitarist magazine's current cover feature (issue 336) - The 101 Best Stompboxes Of All Time - which is on sale now. Find out how Dunlop's Crybaby ranks against other legendary pedals including Ibanez's TS-808 TubeScreamer, EHX's Big Muff Pi and ProCo's RAT2, to name but a few.

Tom Porter worked on MusicRadar from its mid-2007 launch date to 2011, covering a range of music and music making topics, across features, gear news, reviews, interviews and more. A regular NAMM-goer back in the day, Tom now resides permanently in Los Angeles, where he's doing rather well at the Internet Movie Database (IMDB).